检索结果-南通市图书馆

Earth Summit Mission 2022:Scientific Expedition and Research on *** Helps Reveal the Synergy between Westerly Winds and Monsoon and the Resulting Climatic and Environmental Effects

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2023年第2期40卷 187-193页

作者： Yaoming MA Weiqiang MA huaguang dai Lei ZHANG Fanglin SUN Jinqiang ZHANG Nan YAO Jianan HE Zhixuan BAI Yuejian XUAN Yunshuai ZHANG Yuan YUAN Chenyi YANG Weijun SUN Ping ZHAO Minghu DING Kongju ZHU Jie HU Bian Bazhuga Bai Juepingcuo Zhuo Ma Ren Qingnima Suo Langwangdui Yang Zong Haikun WEN Land-Atmosphere Interaction and its Climatic Effects Group State Key Laboratory of Tibetan Plateau Earth SystemResources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China College of Atmospheric Science Lanzhou UniversityLanzhou 730000China National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes Dingri 858200China Kathmandu Center of Research and Education Chinese Academy of SciencesBeijing 100101China China-Pakistan Joint Research Center on Earth Sciences Chinese Academy of SciencesIslamabad 45320Pakistan Meteorological Observatory of Tibetan Autonomous Region Lhasa 850000China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Geography and Environment Shandong Normal UniversityJinan 250014China Meteorological Bureau of Tingri County Tingri 858200China Nanjing Institute of Astronomical Optics&Technology National Astronomical ObservatoriesChinese Academy of SciencesNanjing 210042China

“Earth summit mission 2022”is one of the landmark scientific research activities of the Second Tibetan Plateau Scientific Expedition and Research(STEP).This scientific expedition firstly used advanced technology and methods to detect vertical meteorological elements and produce forecasts for mountain ***“Earth summit mission 2022”Qomolangma scientific expedition exceeded an altitude of over 8000 meters for the first time and carried out a comprehensive scientific investigation mission on the summit of *** the participants,the westerly–monsoon synergy and influence team stationed in the *** region had two tasks:1)detecting the vertical structure of the atmosphere for parameters such as wind,temperature,humidity,and pressure with advanced instruments for high-altitude detection at the *** base camp;and 2)observing extreme weather processes to ensure that members of the mountaineering team could successfully reach the *** this scientific expedition,a better understanding of the vertical structure and weather characteristics of the complex area of *** is gained.

关键词： Earth altitude weather

“中国西北地区典型大震遗迹保护”项目成果介绍

在线全文

学校读者我要写书评

暂无评论

国际地震动态 2006年第9期27卷 2-5页

作者：戴华光中国地震局兰州地震研究所兰州730000

本文详细介绍了“中国西北地区典型大震遗迹保护”项目的立项背景、目标、所开展的主要工作、取得的成果、研究成果的社会效益和对该领域研究未来工作的展望。

关键词：西北地区地震遗迹保护项目介绍

孟加拉湾超级风暴费林对西藏强降水的影响分析

在线全文

学校读者我要写书评

暂无评论

气象 2015年第9期41卷 1086-1094页

作者：德庆徐珺宗志平赤曲罗布坚参代华光西藏自治区气象台拉萨850000 国家气象中心北京100081

利用NCEP/NCAR(2.5°×2.5°)再分析资料和常规、非常规观测资料,通过环境场和中尺度特征较全面细致地分析了孟加拉湾风暴费林(Phailin)对西藏特大暴雪的影响。研究表明:"费林"对强降水的影响主要是登陆减弱为低压后,低压云系分两个阶... 详细信息

利用NCEP/NCAR(2.5°×2.5°)再分析资料和常规、非常规观测资料,通过环境场和中尺度特征较全面细致地分析了孟加拉湾风暴费林(Phailin)对西藏特大暴雪的影响。研究表明:"费林"对强降水的影响主要是登陆减弱为低压后,低压云系分两个阶段形成三个中尺度对流云团,对流云团在南支槽的作用下上高原。而强降水的发生和南风风速的大小有直接的对应关系,西南低空急流建立后西藏南部才出现强降水,而低空急流的建立是靠南支槽的贡献。南风风速和强降水的这一重要关系为此类天气提供了预报着眼点。

关键词：费林(Phailin) 西藏强降水南风风速

在线全文

学校读者我要写书评

暂无评论

青藏高原CMIP6土壤湿度适用性评估

高原山地气象研究 2021年第1期41卷 41-48页

作者：陈涛顾忠顺代华光马鹏飞西藏自治区气候中心拉萨850000 西藏高原大气环境研究重点实验室拉萨850000 西藏自治区气象信息网络中心拉萨850000 西藏自治区气象台拉萨850000

为了解第六次国际耦合模式比较计划(CMIP6)土壤湿度数据在青藏高原的适用性,利用全球陆面数据同化系统(GL-DAS)Noah模型输出的土壤湿度产品,对CMIP6 Historical试验的土壤湿度数据进行评估。结果表明:在青藏高原地区,CMIP6集合平均土壤... 详细信息

为了解第六次国际耦合模式比较计划(CMIP6)土壤湿度数据在青藏高原的适用性,利用全球陆面数据同化系统(GL-DAS)Noah模型输出的土壤湿度产品,对CMIP6 Historical试验的土壤湿度数据进行评估。结果表明:在青藏高原地区,CMIP6集合平均土壤湿度总体高于Noah产品,季节变化幅度明显小于Noah产品;各模式模拟的土壤湿度差异较大,在偏差、线性相关、标准差、场相关4个维度上,表现最好的模式分别为AWI-ESM-1-1-LR、NorESM2-MM、CanESM5、TaiESM1,而EC-Earth3、EC-Earth3-Veg和GFDL-CM4在两个维度上表现突出;综合考虑4个维度,AWI-ESM-1-1-LR等10个模式在高原适用性较好。

关键词：青藏高原土壤湿度 CMIP6 Noah

Research status and prospects of the fractal analysis of metal material surfaces and interfaces

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 20-38页

作者： Qinjin dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe Cui Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

2020年5月珠峰登山气象条件分析及数值预报模式释用

在线全文

学校读者我要写书评

暂无评论

高原科学研究 2021年第4期5卷 10-15页

作者：代华光德吉白珍罗布坚参旦增伦珠西藏自治区气象台西藏拉萨850000 西藏自治区灾害防御技术中心西藏拉萨850000

2020年珠峰高程测量期间,5月9日和21日两次冲顶分别受高原槽和孟加拉湾特强气旋风暴"安攀"影响,珠峰大风和降雪明显,登顶受挫;27日高空急流减弱、无降雪,登山队成功抓住短暂窗口期冲顶成功。文章针对2020年5月珠峰登顶期间天气过程,利用... 详细信息

2020年珠峰高程测量期间,5月9日和21日两次冲顶分别受高原槽和孟加拉湾特强气旋风暴"安攀"影响,珠峰大风和降雪明显,登顶受挫;27日高空急流减弱、无降雪,登山队成功抓住短暂窗口期冲顶成功。文章针对2020年5月珠峰登顶期间天气过程,利用NCEP再分析、定日探空和数值预报产品等数据,分析了3次登顶期间的大气环流特征和模式预报效果。结果表明:(1)高空8 000 m和9 000 m风速小于20 m/s、弱降雪或无降雪天气利于冲顶;(2)数值预报ECMWF和GRAPES_GFS模式对珠峰高空风速的预报与实况接近;(3)GRAPES_GFS模式对于中期登山窗口期的预报最长为5天,优于其他模式;短期3天内ECMWF和GRAPES_GFS预报风速及变化趋势均较为准确;(4)当300 h Pa急流位于西藏期间,定日探空各高度层与珠峰相应高度层风速及其变化趋势较为一致,有较好的参考意义。

关键词：珠峰登山气象条件数值预报模式释用

SensFL:Privacy-Preserving Vertical Federated Learning with Sensitive Regularization

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第1期142卷 385-404页

作者： Chongzhen Zhang Zhichen Liu Xiangrui Xu Fuqiang Hu Jiao dai Baigen Cai Wei Wang School of Automation and Intelligence Beijing Jiaotong UniversityBeijing100044China Shuohuang Railway Development Co. Ltd.National Energy GroupCangzhou062350China Beijing Key Laboratory of Security and Privacy in Intelligent Transportation School of Computer Science and TechnologyBeijing Jiaotong UniversityBeijing100044China

In the realm of Intelligent Railway Transportation Systems,effective multi-party collaboration is crucial due to concerns over privacy and data *** Federated Learning(VFL)has emerged as a promising approach to facilitate such collaboration,allowing diverse entities to collectively enhance machine learning models without the need to share sensitive training ***,existing works have highlighted VFL’s susceptibility to privacy inference attacks,where an honest but curious server could potentially reconstruct a client’s raw data from embeddings uploaded by the *** vulnerability poses a significant threat to VFL-based intelligent railway transportation *** this paper,we introduce SensFL,a novel privacy-enhancing method to against privacy inference attacks in ***,SensFL integrates regularization of the sensitivity of embeddings to the original data into the model training process,effectively limiting the information contained in shared *** reducing the sensitivity of embeddings to the original data,SensFL can effectively resist reverse privacy attacks and prevent the reconstruction of the original data from the *** experiments were conducted on four distinct datasets and three different models to demonstrate the efficacy of *** results show that SensFL can effectively mitigate privacy inference attacks while maintaining the accuracy of the primary learning *** results underscore SensFL’s potential to advance privacy protection technologies within VFL-based intelligent railway systems,addressing critical security concerns in collaborative learning environments.

关键词： Vertical federated learning privacy defenses

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于探空资料的拉萨短期降水预报特征分析

高原山地气象研究 2015年第2期35卷 17-23页

作者：德庆代华光德吉卓玛边巴多吉文胜军西藏自治区气象台拉萨850000 西藏自治区气象服务中心拉萨850000

利用近11年拉萨探空和地面降水资料,挑选811次符合条件的分析对象,对不同相态不同强度不同时次的降水和所对应的探空特征进行了对比分析。夏季拉萨早晨大气水汽含量高于晚上,夜间大气不稳定能量高于凌晨。出现降雨前早晚大气一致有增温... 详细信息

利用近11年拉萨探空和地面降水资料,挑选811次符合条件的分析对象,对不同相态不同强度不同时次的降水和所对应的探空特征进行了对比分析。夏季拉萨早晨大气水汽含量高于晚上,夜间大气不稳定能量高于凌晨。出现降雨前早晚大气一致有增温增湿现象,一般夜雨表现为高低层干热中间湿冷结构,强夜雨为高低层湿热中间干冷。冬季早晚大气温湿差异小于夏季,有降雪时大气层结曲线和露点曲线呈近"漏斗"状,即大气属于上干下湿状态。考虑到无降水大气状况和有降水大气更好区别,本文也统计出5103次无降水个例,给出了无降水的大气特征。

关键词：探空降水大气温湿廓线大气层结参数

在线全文

学校读者我要写书评

暂无评论

珠穆朗玛峰登山气象条件分析

气象与减灾研究 2014年第3期37卷 29-34页

作者：胡初阳次旦巴桑朗珠次旦代华光赤曲西藏自治区气象台西藏拉萨850000

利用珠穆朗玛峰地区定日气象站1959—2009年气象探测资料,分析了珠穆朗玛峰地区的降水、气温、高空风等气象要素变化特征并重点总结珠穆朗玛峰地区主要登山期(春季)成功登顶的天气、气候背景及大气环流形势。结果表明,5月500 hPa环流中... 详细信息

利用珠穆朗玛峰地区定日气象站1959—2009年气象探测资料,分析了珠穆朗玛峰地区的降水、气温、高空风等气象要素变化特征并重点总结珠穆朗玛峰地区主要登山期(春季)成功登顶的天气、气候背景及大气环流形势。结果表明,5月500 hPa环流中高纬度为宽广的低值区,乌拉尔山地区基本维持长波槽或低值中心,咸海—里海和贝加尔湖附近多存在脊区;伊朗高压偏北且东伸至印度半岛,印度副热带高压与咸海、里海附近高压脊同位相叠加且北抬加强,西太平洋副热带高压维持在中南半岛以西;孟加拉湾、印度半岛低槽或低压中心建立,高原南部南支槽不明显;东亚大槽偏强、偏东。对应西藏高原和珠穆朗玛峰地区降水偏弱等特征,5月是攀登珠穆朗玛峰的最佳时机,且20时至凌晨之间更适合登顶。

关键词：珠穆朗玛峰登山环流高空风